1. Patient is at least 21 and less than 80 years of age.
2. Prior to the current stroke event, the patient has an mRS score of 1 of less, and an NIHSS score greater than or equal to 5 at time of intervention.
3. CT/CTA and/or MR/MRA is collected at no more than 60 minutes pre-treatment
4. Neuroimaging demonstrates large vessel proximal occlusion (distal ICA through MCA bifurcation).
5. Symptom onset is within 6 hours of when groin puncture can be achieved.